Question

which of the following is true about the calvin cycle? rubisco fixes o₂ to a carbohydrate molecule. both atp and nadph are needed to make sugars. light energy is converted to chemical energy.

Explanation:

• Rubisco fixes carbon dioxide ($CO_2$), not $O_2$, to a carbon acceptor molecule in the Calvin cycle; the first option is false.
• The Calvin cycle uses ATP for energy and NADPH as a reducing power to convert $CO_2$ into glucose (sugar); this option is true.
• The conversion of light energy to chemical energy occurs in the light-dependent reactions of photosynthesis, not the Calvin cycle (light-independent reactions); the third option is false.

Answer:

Both ATP and NADPH are needed to make sugars.